DNS failures on regular basis

We are running two firewalls with 2 wans and 2 lans (temporary office and internet cafe) on Mon Apr 11 20:18:16 EDT 201 snapshot and are having DNS issues.

We have two entries in the DNS fields on the General Setup menu with no gateway specified and no override for DHCP.

At random intervals, and not apparently related to loading, the DNS resolution fails. This is both for DHCP clients using the firewall for DNS and from the firewall itself using the DNS lookup in the GUI. After a while the DNS will start responding again.

There do not appear to be any entries in the system log that relate to this - ie no errors or warnings.

If you have multi-wan, you really do need to specify at least one DNS server for each gateway under System > General, unless they're dynamic and get their DNS servers over PPPoE/DHCP - still, specifying them manually is better.

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